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- Committer: Teddy Hogeborn
- Date: 2012-06-16 19:30:08 UTC
- Revision ID: teddy@recompile.se-20120616193008-2erbfaw5a5y3yay1
* debian/mandos-client.README.Debian: Update documentation for using
multiple interfaces.
multiple interfaces.
- files removed:
- debian/upstream
- files modified:
- INSTALL
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2014 Teddy Hogeborn
13
* Copyright © 2008-2014 Björn Påhlsson
12
* Copyright © 2008-2012 Teddy Hogeborn
13
* Copyright © 2008-2012 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
33
#ifndef _LARGEFILE_SOURCE
34
34
#define _LARGEFILE_SOURCE
35
#endif /* not _LARGEFILE_SOURCE */
35
#endif
36
36
#ifndef _FILE_OFFSET_BITS
37
37
#define _FILE_OFFSET_BITS 64
38
#endif /* not _FILE_OFFSET_BITS */
38
#endif
39
39
40
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror() */
43
stdout, ferror(), remove() */
44
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
55
55
opendir(), DIR */
56
56
#include <sys/stat.h> /* open(), S_ISREG */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect(),
59
getnameinfo() */
60
#include <fcntl.h> /* open(), unlinkat() */
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
61
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
62
61
*/
63
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
73
72
*/
74
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
74
getuid(), getgid(), seteuid(),
76
setgid(), pause(), _exit(),
77
unlinkat() */
78
#include <arpa/inet.h> /* inet_pton(), htons() */
75
setgid(), pause(), _exit() */
76
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
79
77
#include <iso646.h> /* not, or, and */
80
78
#include <argp.h> /* struct argp_option, error_t, struct
81
79
argp_state, struct argp,
93
91
argz_delete(), argz_append(),
94
92
argz_stringify(), argz_add(),
95
93
argz_count() */
96
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
97
EAI_SYSTEM, gai_strerror() */
98
94
99
95
#ifdef __linux__
100
96
#include <sys/klog.h> /* klogctl() */
142
138
static const char sys_class_net[] = "/sys/class/net";
143
139
char *connect_to = NULL;
144
140
const char *hookdir = HOOKDIR;
145
int hookdir_fd = -1;
146
141
uid_t uid = 65534;
147
142
gid_t gid = 65534;
148
143
159
154
160
155
/* Used for passing in values through the Avahi callback functions */
161
156
typedef struct {
157
AvahiSimplePoll *simple_poll;
162
158
AvahiServer *server;
163
159
gnutls_certificate_credentials_t cred;
164
160
unsigned int dh_bits;
166
162
const char *priority;
167
163
gpgme_ctx_t ctx;
168
164
server *current_server;
169
char *interfaces;
170
size_t interfaces_size;
171
165
} mandos_context;
172
166
173
/* global so signal handler can reach it*/
174
AvahiSimplePoll *simple_poll;
167
/* global context so signal handler can reach it*/
168
mandos_context mc = { .simple_poll = NULL, .server = NULL,
169
.dh_bits = 1024, .priority = "SECURE256"
170
":!CTYPE-X.509:+CTYPE-OPENPGP",
171
.current_server = NULL };
175
172
176
173
sig_atomic_t quit_now = 0;
177
174
int signal_received = 0;
185
182
perror(print_text);
186
183
}
187
184
188
__attribute__((format (gnu_printf, 2, 3), nonnull))
185
__attribute__((format (gnu_printf, 2, 3)))
189
186
int fprintf_plus(FILE *stream, const char *format, ...){
190
187
va_list ap;
191
188
va_start (ap, format);
192
189
193
190
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
194
191
program_invocation_short_name));
195
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
192
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
196
193
}
197
194
198
195
/*
200
197
* bytes. "buffer_capacity" is how much is currently allocated,
201
198
* "buffer_length" is how much is already used.
202
199
*/
203
__attribute__((nonnull, warn_unused_result))
204
200
size_t incbuffer(char **buffer, size_t buffer_length,
205
201
size_t buffer_capacity){
206
202
if(buffer_length + BUFFER_SIZE > buffer_capacity){
207
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
208
if(new_buf == NULL){
209
int old_errno = errno;
210
free(*buffer);
211
errno = old_errno;
212
*buffer = NULL;
203
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
204
if(buffer == NULL){
213
205
return 0;
214
206
}
215
*buffer = new_buf;
216
207
buffer_capacity += BUFFER_SIZE;
217
208
}
218
209
return buffer_capacity;
219
210
}
220
211
221
212
/* Add server to set of servers to retry periodically */
222
__attribute__((nonnull, warn_unused_result))
223
213
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
224
int af, server **current_server){
214
int af){
225
215
int ret;
226
216
server *new_server = malloc(sizeof(server));
227
217
if(new_server == NULL){
236
226
perror_plus("strdup");
237
227
return false;
238
228
}
239
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
240
if(ret == -1){
241
perror_plus("clock_gettime");
242
return false;
243
}
244
229
/* Special case of first server */
245
if(*current_server == NULL){
230
if (mc.current_server == NULL){
246
231
new_server->next = new_server;
247
232
new_server->prev = new_server;
248
*current_server = new_server;
233
mc.current_server = new_server;
234
/* Place the new server last in the list */
249
235
} else {
250
/* Place the new server last in the list */
251
new_server->next = *current_server;
252
new_server->prev = (*current_server)->prev;
236
new_server->next = mc.current_server;
237
new_server->prev = mc.current_server->prev;
253
238
new_server->prev->next = new_server;
254
(*current_server)->prev = new_server;
239
mc.current_server->prev = new_server;
240
}
241
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
242
if(ret == -1){
243
perror_plus("clock_gettime");
244
return false;
255
245
}
256
246
return true;
257
247
}
259
249
/*
260
250
* Initialize GPGME.
261
251
*/
262
__attribute__((nonnull, warn_unused_result))
263
static bool init_gpgme(const char * const seckey,
264
const char * const pubkey,
265
const char * const tempdir,
266
mandos_context *mc){
252
static bool init_gpgme(const char *seckey, const char *pubkey,
253
const char *tempdir){
267
254
gpgme_error_t rc;
268
255
gpgme_engine_info_t engine_info;
269
256
257
270
258
/*
271
259
* Helper function to insert pub and seckey to the engine keyring.
272
260
*/
273
bool import_key(const char * const filename){
261
bool import_key(const char *filename){
274
262
int ret;
275
263
int fd;
276
264
gpgme_data_t pgp_data;
288
276
return false;
289
277
}
290
278
291
rc = gpgme_op_import(mc->ctx, pgp_data);
279
rc = gpgme_op_import(mc.ctx, pgp_data);
292
280
if(rc != GPG_ERR_NO_ERROR){
293
281
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
294
282
gpgme_strsource(rc), gpgme_strerror(rc));
338
326
}
339
327
340
328
/* Create new GPGME "context" */
341
rc = gpgme_new(&(mc->ctx));
329
rc = gpgme_new(&(mc.ctx));
342
330
if(rc != GPG_ERR_NO_ERROR){
343
331
fprintf_plus(stderr, "Mandos plugin mandos-client: "
344
332
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
357
345
* Decrypt OpenPGP data.
358
346
* Returns -1 on error
359
347
*/
360
__attribute__((nonnull, warn_unused_result))
361
348
static ssize_t pgp_packet_decrypt(const char *cryptotext,
362
349
size_t crypto_size,
363
char **plaintext,
364
mandos_context *mc){
350
char **plaintext){
365
351
gpgme_data_t dh_crypto, dh_plain;
366
352
gpgme_error_t rc;
367
353
ssize_t ret;
393
379
394
380
/* Decrypt data from the cryptotext data buffer to the plaintext
395
381
data buffer */
396
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
382
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
397
383
if(rc != GPG_ERR_NO_ERROR){
398
384
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
399
385
gpgme_strsource(rc), gpgme_strerror(rc));
400
386
plaintext_length = -1;
401
387
if(debug){
402
388
gpgme_decrypt_result_t result;
403
result = gpgme_op_decrypt_result(mc->ctx);
389
result = gpgme_op_decrypt_result(mc.ctx);
404
390
if(result == NULL){
405
391
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
406
392
} else {
483
469
return plaintext_length;
484
470
}
485
471
486
__attribute__((warn_unused_result))
487
static const char *safer_gnutls_strerror(int value){
472
static const char * safer_gnutls_strerror(int value){
488
473
const char *ret = gnutls_strerror(value);
489
474
if(ret == NULL)
490
475
ret = "(unknown)";
492
477
}
493
478
494
479
/* GnuTLS log function callback */
495
__attribute__((nonnull))
496
480
static void debuggnutls(__attribute__((unused)) int level,
497
481
const char* string){
498
482
fprintf_plus(stderr, "GnuTLS: %s", string);
499
483
}
500
484
501
__attribute__((nonnull, warn_unused_result))
502
485
static int init_gnutls_global(const char *pubkeyfilename,
503
const char *seckeyfilename,
504
mandos_context *mc){
486
const char *seckeyfilename){
505
487
int ret;
506
488
507
489
if(debug){
524
506
}
525
507
526
508
/* OpenPGP credentials */
527
ret = gnutls_certificate_allocate_credentials(&mc->cred);
509
ret = gnutls_certificate_allocate_credentials(&mc.cred);
528
510
if(ret != GNUTLS_E_SUCCESS){
529
511
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
530
512
safer_gnutls_strerror(ret));
540
522
}
541
523
542
524
ret = gnutls_certificate_set_openpgp_key_file
543
(mc->cred, pubkeyfilename, seckeyfilename,
525
(mc.cred, pubkeyfilename, seckeyfilename,
544
526
GNUTLS_OPENPGP_FMT_BASE64);
545
527
if(ret != GNUTLS_E_SUCCESS){
546
528
fprintf_plus(stderr,
552
534
}
553
535
554
536
/* GnuTLS server initialization */
555
ret = gnutls_dh_params_init(&mc->dh_params);
537
ret = gnutls_dh_params_init(&mc.dh_params);
556
538
if(ret != GNUTLS_E_SUCCESS){
557
539
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
558
540
" initialization: %s\n",
559
541
safer_gnutls_strerror(ret));
560
542
goto globalfail;
561
543
}
562
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
544
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
563
545
if(ret != GNUTLS_E_SUCCESS){
564
546
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
565
547
safer_gnutls_strerror(ret));
566
548
goto globalfail;
567
549
}
568
550
569
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
551
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
570
552
571
553
return 0;
572
554
573
555
globalfail:
574
556
575
gnutls_certificate_free_credentials(mc->cred);
557
gnutls_certificate_free_credentials(mc.cred);
576
558
gnutls_global_deinit();
577
gnutls_dh_params_deinit(mc->dh_params);
559
gnutls_dh_params_deinit(mc.dh_params);
578
560
return -1;
579
561
}
580
562
581
__attribute__((nonnull, warn_unused_result))
582
static int init_gnutls_session(gnutls_session_t *session,
583
mandos_context *mc){
563
static int init_gnutls_session(gnutls_session_t *session){
584
564
int ret;
585
565
/* GnuTLS session creation */
586
566
do {
598
578
{
599
579
const char *err;
600
580
do {
601
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
581
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
602
582
if(quit_now){
603
583
gnutls_deinit(*session);
604
584
return -1;
615
595
616
596
do {
617
597
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
618
mc->cred);
598
mc.cred);
619
599
if(quit_now){
620
600
gnutls_deinit(*session);
621
601
return -1;
631
611
/* ignore client certificate if any. */
632
612
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
633
613
634
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
614
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
635
615
636
616
return 0;
637
617
}
641
621
__attribute__((unused)) const char *txt){}
642
622
643
623
/* Called when a Mandos server is found */
644
__attribute__((nonnull, warn_unused_result))
645
624
static int start_mandos_communication(const char *ip, in_port_t port,
646
625
AvahiIfIndex if_index,
647
int af, mandos_context *mc){
626
int af){
648
627
int ret, tcp_sd = -1;
649
628
ssize_t sret;
650
struct sockaddr_storage to;
629
union {
630
struct sockaddr_in in;
631
struct sockaddr_in6 in6;
632
} to;
651
633
char *buffer = NULL;
652
634
char *decrypted_buffer = NULL;
653
635
size_t buffer_length = 0;
677
659
return -1;
678
660
}
679
661
680
/* If the interface is specified and we have a list of interfaces */
681
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
682
/* Check if the interface is one of the interfaces we are using */
683
bool match = false;
684
{
685
char *interface = NULL;
686
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
687
interface))){
688
if(if_nametoindex(interface) == (unsigned int)if_index){
689
match = true;
690
break;
691
}
692
}
693
}
694
if(not match){
695
/* This interface does not match any in the list, so we don't
696
connect to the server */
697
if(debug){
698
char interface[IF_NAMESIZE];
699
if(if_indextoname((unsigned int)if_index, interface) == NULL){
700
perror_plus("if_indextoname");
701
} else {
702
fprintf_plus(stderr, "Skipping server on non-used interface"
703
" \"%s\"\n",
704
if_indextoname((unsigned int)if_index,
705
interface));
706
}
707
}
708
return -1;
709
}
710
}
711
712
ret = init_gnutls_session(&session, mc);
662
ret = init_gnutls_session(&session);
713
663
if(ret != 0){
714
664
return -1;
715
665
}
734
684
735
685
memset(&to, 0, sizeof(to));
736
686
if(af == AF_INET6){
737
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
738
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
687
to.in6.sin6_family = (sa_family_t)af;
688
ret = inet_pton(af, ip, &to.in6.sin6_addr);
739
689
} else { /* IPv4 */
740
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
741
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
690
to.in.sin_family = (sa_family_t)af;
691
ret = inet_pton(af, ip, &to.in.sin_addr);
742
692
}
743
693
if(ret < 0 ){
744
694
int e = errno;
753
703
goto mandos_end;
754
704
}
755
705
if(af == AF_INET6){
756
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
757
if(IN6_IS_ADDR_LINKLOCAL
758
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
706
to.in6.sin6_port = htons(port);
707
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
708
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
709
-Wunreachable-code*/
759
710
if(if_index == AVAHI_IF_UNSPEC){
760
711
fprintf_plus(stderr, "An IPv6 link-local address is"
761
712
" incomplete without a network interface\n");
763
714
goto mandos_end;
764
715
}
765
716
/* Set the network interface number as scope */
766
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
717
to.in6.sin6_scope_id = (uint32_t)if_index;
767
718
}
768
719
} else {
769
((struct sockaddr_in *)&to)->sin_port = htons(port);
720
to.in.sin_port = htons(port); /* Spurious warnings from
721
-Wconversion and
722
-Wunreachable-code */
770
723
}
771
724
772
725
if(quit_now){
789
742
}
790
743
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
791
744
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
745
const char *pcret;
792
746
if(af == AF_INET6){
793
ret = getnameinfo((struct sockaddr *)&to,
794
sizeof(struct sockaddr_in6),
795
addrstr, sizeof(addrstr), NULL, 0,
796
NI_NUMERICHOST);
747
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
748
sizeof(addrstr));
797
749
} else {
798
ret = getnameinfo((struct sockaddr *)&to,
799
sizeof(struct sockaddr_in),
800
addrstr, sizeof(addrstr), NULL, 0,
801
NI_NUMERICHOST);
750
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
751
sizeof(addrstr));
802
752
}
803
if(ret == EAI_SYSTEM){
804
perror_plus("getnameinfo");
805
} else if(ret != 0) {
806
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
807
} else if(strcmp(addrstr, ip) != 0){
808
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
753
if(pcret == NULL){
754
perror_plus("inet_ntop");
755
} else {
756
if(strcmp(addrstr, ip) != 0){
757
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
758
}
809
759
}
810
760
}
811
761
815
765
}
816
766
817
767
if(af == AF_INET6){
818
ret = connect(tcp_sd, (struct sockaddr *)&to,
819
sizeof(struct sockaddr_in6));
768
ret = connect(tcp_sd, &to.in6, sizeof(to));
820
769
} else {
821
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
822
sizeof(struct sockaddr_in));
770
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
823
771
}
824
772
if(ret < 0){
825
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
773
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
826
774
int e = errno;
827
775
perror_plus("connect");
828
776
errno = e;
989
937
if(buffer_length > 0){
990
938
ssize_t decrypted_buffer_size;
991
939
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
992
&decrypted_buffer, mc);
940
&decrypted_buffer);
993
941
if(decrypted_buffer_size >= 0){
994
942
995
943
written = 0;
1043
991
return retval;
1044
992
}
1045
993
1046
__attribute__((nonnull))
1047
994
static void resolve_callback(AvahiSServiceResolver *r,
1048
995
AvahiIfIndex interface,
1049
996
AvahiProtocol proto,
1057
1004
AVAHI_GCC_UNUSED AvahiStringList *txt,
1058
1005
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1059
1006
flags,
1060
void *mc){
1007
AVAHI_GCC_UNUSED void* userdata){
1061
1008
if(r == NULL){
1062
1009
return;
1063
1010
}
1075
1022
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1076
1023
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1077
1024
domain,
1078
avahi_strerror(avahi_server_errno
1079
(((mandos_context*)mc)->server)));
1025
avahi_strerror(avahi_server_errno(mc.server)));
1080
1026
break;
1081
1027
1082
1028
case AVAHI_RESOLVER_FOUND:
1090
1036
}
1091
1037
int ret = start_mandos_communication(ip, (in_port_t)port,
1092
1038
interface,
1093
avahi_proto_to_af(proto),
1094
mc);
1039
avahi_proto_to_af(proto));
1095
1040
if(ret == 0){
1096
avahi_simple_poll_quit(simple_poll);
1041
avahi_simple_poll_quit(mc.simple_poll);
1097
1042
} else {
1098
1043
if(not add_server(ip, (in_port_t)port, interface,
1099
avahi_proto_to_af(proto),
1100
&((mandos_context*)mc)->current_server)){
1044
avahi_proto_to_af(proto))){
1101
1045
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1102
1046
" list\n", name);
1103
1047
}
1116
1060
const char *domain,
1117
1061
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1118
1062
flags,
1119
void *mc){
1063
AVAHI_GCC_UNUSED void* userdata){
1120
1064
if(b == NULL){
1121
1065
return;
1122
1066
}
1133
1077
case AVAHI_BROWSER_FAILURE:
1134
1078
1135
1079
fprintf_plus(stderr, "(Avahi browser) %s\n",
1136
avahi_strerror(avahi_server_errno
1137
(((mandos_context*)mc)->server)));
1138
avahi_simple_poll_quit(simple_poll);
1080
avahi_strerror(avahi_server_errno(mc.server)));
1081
avahi_simple_poll_quit(mc.simple_poll);
1139
1082
return;
1140
1083
1141
1084
case AVAHI_BROWSER_NEW:
1144
1087
the callback function is called the Avahi server will free the
1145
1088
resolver for us. */
1146
1089
1147
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1148
interface, protocol, name, type,
1149
domain, protocol, 0,
1150
resolve_callback, mc) == NULL)
1090
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1091
name, type, domain, protocol, 0,
1092
resolve_callback, NULL) == NULL)
1151
1093
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1152
1094
" %s\n", name,
1153
avahi_strerror(avahi_server_errno
1154
(((mandos_context*)mc)->server)));
1095
avahi_strerror(avahi_server_errno(mc.server)));
1155
1096
break;
1156
1097
1157
1098
case AVAHI_BROWSER_REMOVE:
1176
1117
signal_received = sig;
1177
1118
int old_errno = errno;
1178
1119
/* set main loop to exit */
1179
if(simple_poll != NULL){
1180
avahi_simple_poll_quit(simple_poll);
1120
if(mc.simple_poll != NULL){
1121
avahi_simple_poll_quit(mc.simple_poll);
1181
1122
}
1182
1123
errno = old_errno;
1183
1124
}
1184
1125
1185
__attribute__((nonnull, warn_unused_result))
1186
1126
bool get_flags(const char *ifname, struct ifreq *ifr){
1187
1127
int ret;
1188
1128
error_t ret_errno;
1207
1147
return true;
1208
1148
}
1209
1149
1210
__attribute__((nonnull, warn_unused_result))
1211
1150
bool good_flags(const char *ifname, const struct ifreq *ifr){
1212
1151
1213
1152
/* Reject the loopback device */
1255
1194
* corresponds to an acceptable network device.
1256
1195
* (This function is passed to scandir(3) as a filter function.)
1257
1196
*/
1258
__attribute__((nonnull, warn_unused_result))
1259
1197
int good_interface(const struct dirent *if_entry){
1260
1198
if(if_entry->d_name[0] == '.'){
1261
1199
return 0;
1279
1217
/*
1280
1218
* This function determines if a network interface is up.
1281
1219
*/
1282
__attribute__((nonnull, warn_unused_result))
1283
1220
bool interface_is_up(const char *interface){
1284
1221
struct ifreq ifr;
1285
1222
if(not get_flags(interface, &ifr)){
1296
1233
/*
1297
1234
* This function determines if a network interface is running
1298
1235
*/
1299
__attribute__((nonnull, warn_unused_result))
1300
1236
bool interface_is_running(const char *interface){
1301
1237
struct ifreq ifr;
1302
1238
if(not get_flags(interface, &ifr)){
1310
1246
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1311
1247
}
1312
1248
1313
__attribute__((nonnull, pure, warn_unused_result))
1314
1249
int notdotentries(const struct dirent *direntry){
1315
1250
/* Skip "." and ".." */
1316
1251
if(direntry->d_name[0] == '.'
1323
1258
}
1324
1259
1325
1260
/* Is this directory entry a runnable program? */
1326
__attribute__((nonnull, warn_unused_result))
1327
1261
int runnable_hook(const struct dirent *direntry){
1328
1262
int ret;
1329
1263
size_t sret;
1337
1271
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1338
1272
"abcdefghijklmnopqrstuvwxyz"
1339
1273
"0123456789"
1340
"_.-");
1274
"_-");
1341
1275
if((direntry->d_name)[sret] != '\0'){
1342
1276
/* Contains non-allowed characters */
1343
1277
if(debug){
1347
1281
return 0;
1348
1282
}
1349
1283
1350
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1284
char *fullname = NULL;
1285
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1286
if(ret < 0){
1287
perror_plus("asprintf");
1288
return 0;
1289
}
1290
1291
ret = stat(fullname, &st);
1351
1292
if(ret == -1){
1352
1293
if(debug){
1353
1294
perror_plus("Could not stat hook");
1377
1318
return 1;
1378
1319
}
1379
1320
1380
__attribute__((nonnull, warn_unused_result))
1381
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1382
mandos_context *mc){
1321
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1383
1322
int ret;
1384
1323
struct timespec now;
1385
1324
struct timespec waited_time;
1386
1325
intmax_t block_time;
1387
1326
1388
1327
while(true){
1389
if(mc->current_server == NULL){
1390
if(debug){
1328
if(mc.current_server == NULL){
1329
if (debug){
1391
1330
fprintf_plus(stderr, "Wait until first server is found."
1392
1331
" No timeout!\n");
1393
1332
}
1394
1333
ret = avahi_simple_poll_iterate(s, -1);
1395
1334
} else {
1396
if(debug){
1335
if (debug){
1397
1336
fprintf_plus(stderr, "Check current_server if we should run"
1398
1337
" it, or wait\n");
1399
1338
}
1406
1345
/* Calculating in ms how long time between now and server
1407
1346
who we visted longest time ago. Now - last seen. */
1408
1347
waited_time.tv_sec = (now.tv_sec
1409
- mc->current_server->last_seen.tv_sec);
1348
- mc.current_server->last_seen.tv_sec);
1410
1349
waited_time.tv_nsec = (now.tv_nsec
1411
- mc->current_server->last_seen.tv_nsec);
1350
- mc.current_server->last_seen.tv_nsec);
1412
1351
/* total time is 10s/10,000ms.
1413
1352
Converting to s from ms by dividing by 1,000,
1414
1353
and ns to ms by dividing by 1,000,000. */
1416
1355
- ((intmax_t)waited_time.tv_sec * 1000))
1417
1356
- ((intmax_t)waited_time.tv_nsec / 1000000));
1418
1357
1419
if(debug){
1358
if (debug){
1420
1359
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1421
1360
block_time);
1422
1361
}
1423
1362
1424
1363
if(block_time <= 0){
1425
ret = start_mandos_communication(mc->current_server->ip,
1426
mc->current_server->port,
1427
mc->current_server->if_index,
1428
mc->current_server->af, mc);
1364
ret = start_mandos_communication(mc.current_server->ip,
1365
mc.current_server->port,
1366
mc.current_server->if_index,
1367
mc.current_server->af);
1429
1368
if(ret == 0){
1430
avahi_simple_poll_quit(s);
1369
avahi_simple_poll_quit(mc.simple_poll);
1431
1370
return 0;
1432
1371
}
1433
1372
ret = clock_gettime(CLOCK_MONOTONIC,
1434
&mc->current_server->last_seen);
1373
&mc.current_server->last_seen);
1435
1374
if(ret == -1){
1436
1375
perror_plus("clock_gettime");
1437
1376
return -1;
1438
1377
}
1439
mc->current_server = mc->current_server->next;
1378
mc.current_server = mc.current_server->next;
1440
1379
block_time = 0; /* Call avahi to find new Mandos
1441
1380
servers, but don't block */
1442
1381
}
1444
1383
ret = avahi_simple_poll_iterate(s, (int)block_time);
1445
1384
}
1446
1385
if(ret != 0){
1447
if(ret > 0 or errno != EINTR){
1386
if (ret > 0 or errno != EINTR){
1448
1387
return (ret != 1) ? ret : 0;
1449
1388
}
1450
1389
}
1452
1391
}
1453
1392
1454
1393
/* Set effective uid to 0, return errno */
1455
__attribute__((warn_unused_result))
1456
1394
error_t raise_privileges(void){
1457
1395
error_t old_errno = errno;
1458
1396
error_t ret_errno = 0;
1459
1397
if(seteuid(0) == -1){
1460
1398
ret_errno = errno;
1399
perror_plus("seteuid");
1461
1400
}
1462
1401
errno = old_errno;
1463
1402
return ret_errno;
1464
1403
}
1465
1404
1466
1405
/* Set effective and real user ID to 0. Return errno. */
1467
__attribute__((warn_unused_result))
1468
1406
error_t raise_privileges_permanently(void){
1469
1407
error_t old_errno = errno;
1470
1408
error_t ret_errno = raise_privileges();
1474
1412
}
1475
1413
if(setuid(0) == -1){
1476
1414
ret_errno = errno;
1415
perror_plus("seteuid");
1477
1416
}
1478
1417
errno = old_errno;
1479
1418
return ret_errno;
1480
1419
}
1481
1420
1482
1421
/* Set effective user ID to unprivileged saved user ID */
1483
__attribute__((warn_unused_result))
1484
1422
error_t lower_privileges(void){
1485
1423
error_t old_errno = errno;
1486
1424
error_t ret_errno = 0;
1487
1425
if(seteuid(uid) == -1){
1488
1426
ret_errno = errno;
1427
perror_plus("seteuid");
1489
1428
}
1490
1429
errno = old_errno;
1491
1430
return ret_errno;
1492
1431
}
1493
1432
1494
1433
/* Lower privileges permanently */
1495
__attribute__((warn_unused_result))
1496
1434
error_t lower_privileges_permanently(void){
1497
1435
error_t old_errno = errno;
1498
1436
error_t ret_errno = 0;
1499
1437
if(setuid(uid) == -1){
1500
1438
ret_errno = errno;
1439
perror_plus("setuid");
1501
1440
}
1502
1441
errno = old_errno;
1503
1442
return ret_errno;
1504
1443
}
1505
1444
1506
__attribute__((nonnull))
1507
void run_network_hooks(const char *mode, const char *interface,
1445
bool run_network_hooks(const char *mode, const char *interface,
1508
1446
const float delay){
1509
struct dirent **direntries = NULL;
1510
if(hookdir_fd == -1){
1511
hookdir_fd = open(hookdir, O_RDONLY);
1512
if(hookdir_fd == -1){
1513
if(errno == ENOENT){
1514
if(debug){
1515
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1516
" found\n", hookdir);
1517
}
1518
} else {
1519
perror_plus("open");
1520
}
1521
return;
1522
}
1523
}
1524
#ifdef __GLIBC__
1525
#if __GLIBC_PREREQ(2, 15)
1526
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1527
runnable_hook, alphasort);
1528
#else /* not __GLIBC_PREREQ(2, 15) */
1529
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1530
alphasort);
1531
#endif /* not __GLIBC_PREREQ(2, 15) */
1532
#else /* not __GLIBC__ */
1533
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1534
alphasort);
1535
#endif /* not __GLIBC__ */
1447
struct dirent **direntries;
1448
struct dirent *direntry;
1449
int ret;
1450
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1451
alphasort);
1536
1452
if(numhooks == -1){
1537
perror_plus("scandir");
1538
return;
1539
}
1540
struct dirent *direntry;
1541
int ret;
1542
int devnull = open("/dev/null", O_RDONLY);
1543
for(int i = 0; i < numhooks; i++){
1544
direntry = direntries[i];
1545
if(debug){
1546
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1547
direntry->d_name);
1453
if(errno == ENOENT){
1454
if(debug){
1455
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1456
" found\n", hookdir);
1457
}
1458
} else {
1459
perror_plus("scandir");
1548
1460
}
1549
pid_t hook_pid = fork();
1550
if(hook_pid == 0){
1551
/* Child */
1552
/* Raise privileges */
1553
errno = raise_privileges_permanently();
1554
if(errno != 0){
1555
perror_plus("Failed to raise privileges");
1556
_exit(EX_NOPERM);
1557
}
1558
/* Set group */
1559
errno = 0;
1560
ret = setgid(0);
1561
if(ret == -1){
1562
perror_plus("setgid");
1563
_exit(EX_NOPERM);
1564
}
1565
/* Reset supplementary groups */
1566
errno = 0;
1567
ret = setgroups(0, NULL);
1568
if(ret == -1){
1569
perror_plus("setgroups");
1570
_exit(EX_NOPERM);
1571
}
1572
ret = dup2(devnull, STDIN_FILENO);
1573
if(ret == -1){
1574
perror_plus("dup2(devnull, STDIN_FILENO)");
1575
_exit(EX_OSERR);
1576
}
1577
ret = close(devnull);
1578
if(ret == -1){
1579
perror_plus("close");
1580
_exit(EX_OSERR);
1581
}
1582
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1583
if(ret == -1){
1584
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1585
_exit(EX_OSERR);
1586
}
1587
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1588
if(ret == -1){
1589
perror_plus("setenv");
1590
_exit(EX_OSERR);
1591
}
1592
ret = setenv("DEVICE", interface, 1);
1593
if(ret == -1){
1594
perror_plus("setenv");
1595
_exit(EX_OSERR);
1596
}
1597
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1598
if(ret == -1){
1599
perror_plus("setenv");
1600
_exit(EX_OSERR);
1601
}
1602
ret = setenv("MODE", mode, 1);
1603
if(ret == -1){
1604
perror_plus("setenv");
1605
_exit(EX_OSERR);
1606
}
1607
char *delaystring;
1608
ret = asprintf(&delaystring, "%f", (double)delay);
1609
if(ret == -1){
1461
} else {
1462
int devnull = open("/dev/null", O_RDONLY);
1463
for(int i = 0; i < numhooks; i++){
1464
direntry = direntries[i];
1465
char *fullname = NULL;
1466
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1467
if(ret < 0){
1610
1468
perror_plus("asprintf");
1611
_exit(EX_OSERR);
1612
}
1613
ret = setenv("DELAY", delaystring, 1);
1614
if(ret == -1){
1469
continue;
1470
}
1471
if(debug){
1472
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1473
direntry->d_name);
1474
}
1475
pid_t hook_pid = fork();
1476
if(hook_pid == 0){
1477
/* Child */
1478
/* Raise privileges */
1479
raise_privileges_permanently();
1480
/* Set group */
1481
errno = 0;
1482
ret = setgid(0);
1483
if(ret == -1){
1484
perror_plus("setgid");
1485
}
1486
/* Reset supplementary groups */
1487
errno = 0;
1488
ret = setgroups(0, NULL);
1489
if(ret == -1){
1490
perror_plus("setgroups");
1491
}
1492
dup2(devnull, STDIN_FILENO);
1493
close(devnull);
1494
dup2(STDERR_FILENO, STDOUT_FILENO);
1495
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1496
if(ret == -1){
1497
perror_plus("setenv");
1498
_exit(EX_OSERR);
1499
}
1500
ret = setenv("DEVICE", interface, 1);
1501
if(ret == -1){
1502
perror_plus("setenv");
1503
_exit(EX_OSERR);
1504
}
1505
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1506
if(ret == -1){
1507
perror_plus("setenv");
1508
_exit(EX_OSERR);
1509
}
1510
ret = setenv("MODE", mode, 1);
1511
if(ret == -1){
1512
perror_plus("setenv");
1513
_exit(EX_OSERR);
1514
}
1515
char *delaystring;
1516
ret = asprintf(&delaystring, "%f", delay);
1517
if(ret == -1){
1518
perror_plus("asprintf");
1519
_exit(EX_OSERR);
1520
}
1521
ret = setenv("DELAY", delaystring, 1);
1522
if(ret == -1){
1523
free(delaystring);
1524
perror_plus("setenv");
1525
_exit(EX_OSERR);
1526
}
1615
1527
free(delaystring);
1616
perror_plus("setenv");
1617
_exit(EX_OSERR);
1618
}
1619
free(delaystring);
1620
if(connect_to != NULL){
1621
ret = setenv("CONNECT", connect_to, 1);
1622
if(ret == -1){
1623
perror_plus("setenv");
1624
_exit(EX_OSERR);
1625
}
1626
}
1627
int hook_fd = openat(hookdir_fd, direntry->d_name, O_RDONLY);
1628
if(hook_fd == -1){
1629
perror_plus("openat");
1630
_exit(EXIT_FAILURE);
1631
}
1632
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1633
perror_plus("close");
1634
_exit(EXIT_FAILURE);
1635
}
1636
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
1637
environ) == -1){
1638
perror_plus("fexecve");
1639
_exit(EXIT_FAILURE);
1640
}
1641
} else {
1642
int status;
1643
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1644
perror_plus("waitpid");
1645
continue;
1646
}
1647
if(WIFEXITED(status)){
1648
if(WEXITSTATUS(status) != 0){
1649
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1650
" with status %d\n", direntry->d_name,
1651
WEXITSTATUS(status));
1652
continue;
1653
}
1654
} else if(WIFSIGNALED(status)){
1655
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1656
" signal %d\n", direntry->d_name,
1657
WTERMSIG(status));
1658
continue;
1528
if(connect_to != NULL){
1529
ret = setenv("CONNECT", connect_to, 1);
1530
if(ret == -1){
1531
perror_plus("setenv");
1532
_exit(EX_OSERR);
1533
}
1534
}
1535
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1536
perror_plus("execl");
1537
_exit(EXIT_FAILURE);
1538
}
1659
1539
} else {
1660
fprintf_plus(stderr, "Warning: network hook \"%s\""
1661
" crashed\n", direntry->d_name);
1662
continue;
1663
}
1664
}
1665
if(debug){
1666
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1667
direntry->d_name);
1668
}
1669
}
1670
free(direntries);
1671
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1672
perror_plus("close");
1673
} else {
1674
hookdir_fd = -1;
1675
}
1676
close(devnull);
1540
int status;
1541
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1542
perror_plus("waitpid");
1543
free(fullname);
1544
continue;
1545
}
1546
if(WIFEXITED(status)){
1547
if(WEXITSTATUS(status) != 0){
1548
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1549
" with status %d\n", direntry->d_name,
1550
WEXITSTATUS(status));
1551
free(fullname);
1552
continue;
1553
}
1554
} else if(WIFSIGNALED(status)){
1555
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1556
" signal %d\n", direntry->d_name,
1557
WTERMSIG(status));
1558
free(fullname);
1559
continue;
1560
} else {
1561
fprintf_plus(stderr, "Warning: network hook \"%s\""
1562
" crashed\n", direntry->d_name);
1563
free(fullname);
1564
continue;
1565
}
1566
}
1567
free(fullname);
1568
if(debug){
1569
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1570
direntry->d_name);
1571
}
1572
}
1573
close(devnull);
1574
}
1575
return true;
1677
1576
}
1678
1577
1679
__attribute__((nonnull, warn_unused_result))
1680
1578
error_t bring_up_interface(const char *const interface,
1681
1579
const float delay){
1580
int sd = -1;
1682
1581
error_t old_errno = errno;
1683
int ret;
1582
error_t ret_errno = 0;
1583
int ret, ret_setflags;
1684
1584
struct ifreq network;
1685
1585
unsigned int if_index = if_nametoindex(interface);
1686
1586
if(if_index == 0){
1695
1595
}
1696
1596
1697
1597
if(not interface_is_up(interface)){
1698
error_t ret_errno = 0, ioctl_errno = 0;
1699
if(not get_flags(interface, &network)){
1598
if(not get_flags(interface, &network) and debug){
1700
1599
ret_errno = errno;
1701
1600
fprintf_plus(stderr, "Failed to get flags for interface "
1702
1601
"\"%s\"\n", interface);
1703
errno = old_errno;
1704
1602
return ret_errno;
1705
1603
}
1706
network.ifr_flags |= IFF_UP; /* set flag */
1604
network.ifr_flags |= IFF_UP;
1707
1605
1708
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1709
if(sd == -1){
1606
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1607
if(sd < 0){
1710
1608
ret_errno = errno;
1711
1609
perror_plus("socket");
1712
1610
errno = old_errno;
1713
1611
return ret_errno;
1714
1612
}
1715
1613
1716
1614
if(quit_now){
1717
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1718
if(ret == -1){
1719
perror_plus("close");
1720
}
1615
close(sd);
1721
1616
errno = old_errno;
1722
1617
return EINTR;
1723
1618
}
1727
1622
interface);
1728
1623
}
1729
1624
1730
/* Raise privileges */
1731
ret_errno = raise_privileges();
1732
if(ret_errno != 0){
1733
errno = ret_errno;
1734
perror_plus("Failed to raise privileges");
1735
}
1625
/* Raise priviliges */
1626
raise_privileges();
1736
1627
1737
1628
#ifdef __linux__
1738
int ret_linux;
1739
bool restore_loglevel = false;
1740
if(ret_errno == 0){
1741
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1742
messages about the network interface to mess up the prompt */
1743
ret_linux = klogctl(8, NULL, 5);
1744
if(ret_linux == -1){
1745
perror_plus("klogctl");
1746
} else {
1747
restore_loglevel = true;
1748
}
1629
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1630
messages about the network interface to mess up the prompt */
1631
int ret_linux = klogctl(8, NULL, 5);
1632
bool restore_loglevel = true;
1633
if(ret_linux == -1){
1634
restore_loglevel = false;
1635
perror_plus("klogctl");
1749
1636
}
1750
1637
#endif /* __linux__ */
1751
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1752
ioctl_errno = errno;
1638
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1639
ret_errno = errno;
1753
1640
#ifdef __linux__
1754
1641
if(restore_loglevel){
1755
1642
ret_linux = klogctl(7, NULL, 0);
1759
1646
}
1760
1647
#endif /* __linux__ */
1761
1648
1762
/* If raise_privileges() succeeded above */
1763
if(ret_errno == 0){
1764
/* Lower privileges */
1765
ret_errno = lower_privileges();
1766
if(ret_errno != 0){
1767
errno = ret_errno;
1768
perror_plus("Failed to lower privileges");
1769
}
1770
}
1649
/* Lower privileges */
1650
lower_privileges();
1771
1651
1772
1652
/* Close the socket */
1773
1653
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1776
1656
}
1777
1657
1778
1658
if(ret_setflags == -1){
1779
errno = ioctl_errno;
1659
errno = ret_errno;
1780
1660
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1781
1661
errno = old_errno;
1782
return ioctl_errno;
1662
return ret_errno;
1783
1663
}
1784
1664
} else if(debug){
1785
1665
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1803
1683
return 0;
1804
1684
}
1805
1685
1806
__attribute__((nonnull, warn_unused_result))
1807
1686
error_t take_down_interface(const char *const interface){
1687
int sd = -1;
1808
1688
error_t old_errno = errno;
1689
error_t ret_errno = 0;
1690
int ret, ret_setflags;
1809
1691
struct ifreq network;
1810
1692
unsigned int if_index = if_nametoindex(interface);
1811
1693
if(if_index == 0){
1814
1696
return ENXIO;
1815
1697
}
1816
1698
if(interface_is_up(interface)){
1817
error_t ret_errno = 0, ioctl_errno = 0;
1818
1699
if(not get_flags(interface, &network) and debug){
1819
1700
ret_errno = errno;
1820
1701
fprintf_plus(stderr, "Failed to get flags for interface "
1821
1702
"\"%s\"\n", interface);
1822
errno = old_errno;
1823
1703
return ret_errno;
1824
1704
}
1825
1705
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1826
1706
1827
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1828
if(sd == -1){
1707
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1708
if(sd < 0){
1829
1709
ret_errno = errno;
1830
1710
perror_plus("socket");
1831
1711
errno = old_errno;
1837
1717
interface);
1838
1718
}
1839
1719
1840
/* Raise privileges */
1841
ret_errno = raise_privileges();
1842
if(ret_errno != 0){
1843
errno = ret_errno;
1844
perror_plus("Failed to raise privileges");
1845
}
1846
1847
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1848
ioctl_errno = errno;
1849
1850
/* If raise_privileges() succeeded above */
1851
if(ret_errno == 0){
1852
/* Lower privileges */
1853
ret_errno = lower_privileges();
1854
if(ret_errno != 0){
1855
errno = ret_errno;
1856
perror_plus("Failed to lower privileges");
1857
}
1858
}
1720
/* Raise priviliges */
1721
raise_privileges();
1722
1723
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1724
ret_errno = errno;
1725
1726
/* Lower privileges */
1727
lower_privileges();
1859
1728
1860
1729
/* Close the socket */
1861
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1730
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1862
1731
if(ret == -1){
1863
1732
perror_plus("close");
1864
1733
}
1865
1734
1866
1735
if(ret_setflags == -1){
1867
errno = ioctl_errno;
1736
errno = ret_errno;
1868
1737
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1869
1738
errno = old_errno;
1870
return ioctl_errno;
1739
return ret_errno;
1871
1740
}
1872
1741
} else if(debug){
1873
1742
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1879
1748
}
1880
1749
1881
1750
int main(int argc, char *argv[]){
1882
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1883
.priority = "SECURE256:!CTYPE-X.509:"
1884
"+CTYPE-OPENPGP", .current_server = NULL,
1885
.interfaces = NULL, .interfaces_size = 0 };
1886
1751
AvahiSServiceBrowser *sb = NULL;
1887
1752
error_t ret_errno;
1888
1753
int ret;
1889
1754
intmax_t tmpmax;
1890
1755
char *tmp;
1891
1756
int exitcode = EXIT_SUCCESS;
1757
char *interfaces = NULL;
1758
size_t interfaces_size = 0;
1892
1759
char *interfaces_to_take_down = NULL;
1893
1760
size_t interfaces_to_take_down_size = 0;
1894
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
1895
char old_tempdir[] = "/tmp/mandosXXXXXX";
1896
char *tempdir = NULL;
1761
char tempdir[] = "/tmp/mandosXXXXXX";
1762
bool tempdir_created = false;
1897
1763
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1898
1764
const char *seckey = PATHDIR "/" SECKEY;
1899
1765
const char *pubkey = PATHDIR "/" PUBKEY;
1900
1766
char *interfaces_hooks = NULL;
1767
size_t interfaces_hooks_size = 0;
1901
1768
1902
1769
bool gnutls_initialized = false;
1903
1770
bool gpgme_initialized = false;
1994
1861
connect_to = arg;
1995
1862
break;
1996
1863
case 'i': /* --interface */
1997
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
1998
arg, (int)',');
1864
ret_errno = argz_add_sep(&interfaces, &interfaces_size, arg,
1865
(int)',');
1999
1866
if(ret_errno != 0){
2000
1867
argp_error(state, "%s", strerror(ret_errno));
2001
1868
}
2081
1948
/* Work around Debian bug #633582:
2082
1949
<http://bugs.debian.org/633582> */
2083
1950
2084
/* Re-raise privileges */
2085
ret_errno = raise_privileges();
2086
if(ret_errno != 0){
2087
errno = ret_errno;
2088
perror_plus("Failed to raise privileges");
2089
} else {
1951
/* Re-raise priviliges */
1952
if(raise_privileges() == 0){
2090
1953
struct stat st;
2091
1954
2092
1955
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2132
1995
}
2133
1996
2134
1997
/* Lower privileges */
2135
ret_errno = lower_privileges();
2136
if(ret_errno != 0){
2137
errno = ret_errno;
2138
perror_plus("Failed to lower privileges");
1998
errno = 0;
1999
ret = seteuid(uid);
2000
if(ret == -1){
2001
perror_plus("seteuid");
2139
2002
}
2140
2003
}
2141
2004
}
2142
2005
2143
/* Remove invalid interface names (except "none") */
2006
/* Remove empty interface names */
2144
2007
{
2145
2008
char *interface = NULL;
2146
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2009
while((interface = argz_next(interfaces, interfaces_size,
2147
2010
interface))){
2148
if(strcmp(interface, "none") != 0
2149
and if_nametoindex(interface) == 0){
2150
if(interface[0] != '\0'){
2011
if(if_nametoindex(interface) == 0){
2012
if(interface[0] != '\0' and strcmp(interface, "none") != 0){
2151
2013
fprintf_plus(stderr, "Not using nonexisting interface"
2152
2014
" \"%s\"\n", interface);
2153
2015
}
2154
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2016
argz_delete(&interfaces, &interfaces_size, interface);
2155
2017
interface = NULL;
2156
2018
}
2157
2019
}
2159
2021
2160
2022
/* Run network hooks */
2161
2023
{
2162
if(mc.interfaces != NULL){
2163
interfaces_hooks = malloc(mc.interfaces_size);
2024
2025
if(interfaces != NULL){
2026
interfaces_hooks = malloc(interfaces_size);
2164
2027
if(interfaces_hooks == NULL){
2165
2028
perror_plus("malloc");
2166
2029
goto end;
2167
2030
}
2168
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2169
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2170
}
2171
run_network_hooks("start", interfaces_hooks != NULL ?
2172
interfaces_hooks : "", delay);
2031
memcpy(interfaces_hooks, interfaces, interfaces_size);
2032
interfaces_hooks_size = interfaces_size;
2033
argz_stringify(interfaces_hooks, interfaces_hooks_size,
2034
(int)',');
2035
}
2036
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2037
interfaces_hooks : "", delay)){
2038
goto end;
2039
}
2173
2040
}
2174
2041
2175
2042
if(not debug){
2180
2047
from the signal handler */
2181
2048
/* Initialize the pseudo-RNG for Avahi */
2182
2049
srand((unsigned int) time(NULL));
2183
simple_poll = avahi_simple_poll_new();
2184
if(simple_poll == NULL){
2050
mc.simple_poll = avahi_simple_poll_new();
2051
if(mc.simple_poll == NULL){
2185
2052
fprintf_plus(stderr,
2186
2053
"Avahi: Failed to create simple poll object.\n");
2187
2054
exitcode = EX_UNAVAILABLE;
2252
2119
}
2253
2120
2254
2121
/* If no interfaces were specified, make a list */
2255
if(mc.interfaces == NULL){
2256
struct dirent **direntries = NULL;
2122
if(interfaces == NULL){
2123
struct dirent **direntries;
2257
2124
/* Look for any good interfaces */
2258
2125
ret = scandir(sys_class_net, &direntries, good_interface,
2259
2126
alphasort);
2260
2127
if(ret >= 1){
2261
2128
/* Add all found interfaces to interfaces list */
2262
2129
for(int i = 0; i < ret; ++i){
2263
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2130
ret_errno = argz_add(&interfaces, &interfaces_size,
2264
2131
direntries[i]->d_name);
2265
2132
if(ret_errno != 0){
2266
errno = ret_errno;
2267
2133
perror_plus("argz_add");
2268
2134
continue;
2269
2135
}
2274
2140
}
2275
2141
free(direntries);
2276
2142
} else {
2277
if(ret == 0){
2278
free(direntries);
2279
}
2143
free(direntries);
2280
2144
fprintf_plus(stderr, "Could not find a network interface\n");
2281
2145
exitcode = EXIT_FAILURE;
2282
2146
goto end;
2283
2147
}
2284
2148
}
2285
2149
2286
/* Bring up interfaces which are down, and remove any "none"s */
2287
{
2150
/* If we only got one interface, explicitly use only that one */
2151
if(argz_count(interfaces, interfaces_size) == 1){
2152
if(debug){
2153
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2154
interfaces);
2155
}
2156
if_index = (AvahiIfIndex)if_nametoindex(interfaces);
2157
}
2158
2159
/* Bring up interfaces which are down */
2160
if(not (argz_count(interfaces, interfaces_size) == 1
2161
and strcmp(interfaces, "none") == 0)){
2288
2162
char *interface = NULL;
2289
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2163
while((interface = argz_next(interfaces, interfaces_size,
2290
2164
interface))){
2291
/* If interface name is "none", stop bringing up interfaces.
2292
Also remove all instances of "none" from the list */
2293
if(strcmp(interface, "none") == 0){
2294
argz_delete(&mc.interfaces, &mc.interfaces_size,
2295
interface);
2296
interface = NULL;
2297
while((interface = argz_next(mc.interfaces,
2298
mc.interfaces_size, interface))){
2299
if(strcmp(interface, "none") == 0){
2300
argz_delete(&mc.interfaces, &mc.interfaces_size,
2301
interface);
2302
interface = NULL;
2303
}
2304
}
2305
break;
2306
}
2307
2165
bool interface_was_up = interface_is_up(interface);
2308
errno = bring_up_interface(interface, delay);
2166
ret = bring_up_interface(interface, delay);
2309
2167
if(not interface_was_up){
2310
if(errno != 0){
2168
if(ret != 0){
2169
errno = ret;
2311
2170
perror_plus("Failed to bring up interface");
2312
2171
} else {
2313
errno = argz_add(&interfaces_to_take_down,
2314
&interfaces_to_take_down_size,
2315
interface);
2316
if(errno != 0){
2317
perror_plus("argz_add");
2318
}
2172
ret_errno = argz_add(&interfaces_to_take_down,
2173
&interfaces_to_take_down_size,
2174
interface);
2319
2175
}
2320
2176
}
2321
2177
}
2178
free(interfaces);
2179
interfaces = NULL;
2180
interfaces_size = 0;
2322
2181
if(debug and (interfaces_to_take_down == NULL)){
2323
2182
fprintf_plus(stderr, "No interfaces were brought up\n");
2324
2183
}
2325
2184
}
2326
2185
2327
/* If we only got one interface, explicitly use only that one */
2328
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2329
if(debug){
2330
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2331
mc.interfaces);
2332
}
2333
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2334
}
2335
2336
2186
if(quit_now){
2337
2187
goto end;
2338
2188
}
2339
2189
2340
ret = init_gnutls_global(pubkey, seckey, &mc);
2190
ret = init_gnutls_global(pubkey, seckey);
2341
2191
if(ret == -1){
2342
2192
fprintf_plus(stderr, "init_gnutls_global failed\n");
2343
2193
exitcode = EX_UNAVAILABLE;
2350
2200
goto end;
2351
2201
}
2352
2202
2353
/* Try /run/tmp before /tmp */
2354
tempdir = mkdtemp(run_tempdir);
2355
if(tempdir == NULL and errno == ENOENT){
2356
if(debug){
2357
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2358
run_tempdir, old_tempdir);
2359
}
2360
tempdir = mkdtemp(old_tempdir);
2361
}
2362
if(tempdir == NULL){
2203
if(mkdtemp(tempdir) == NULL){
2363
2204
perror_plus("mkdtemp");
2364
2205
goto end;
2365
2206
}
2207
tempdir_created = true;
2366
2208
2367
2209
if(quit_now){
2368
2210
goto end;
2369
2211
}
2370
2212
2371
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2213
if(not init_gpgme(pubkey, seckey, tempdir)){
2372
2214
fprintf_plus(stderr, "init_gpgme failed\n");
2373
2215
exitcode = EX_UNAVAILABLE;
2374
2216
goto end;
2404
2246
exitcode = EX_USAGE;
2405
2247
goto end;
2406
2248
}
2407
2249
2408
2250
if(quit_now){
2409
2251
goto end;
2410
2252
}
2431
2273
}
2432
2274
2433
2275
while(not quit_now){
2434
ret = start_mandos_communication(address, port, if_index, af,
2435
&mc);
2276
ret = start_mandos_communication(address, port, if_index, af);
2436
2277
if(quit_now or ret == 0){
2437
2278
break;
2438
2279
}
2440
2281
fprintf_plus(stderr, "Retrying in %d seconds\n",
2441
2282
(int)retry_interval);
2442
2283
}
2443
sleep((unsigned int)retry_interval);
2284
sleep((int)retry_interval);
2444
2285
}
2445
2286
2446
if(not quit_now){
2287
if (not quit_now){
2447
2288
exitcode = EXIT_SUCCESS;
2448
2289
}
2449
2290
2464
2305
config.publish_domain = 0;
2465
2306
2466
2307
/* Allocate a new server */
2467
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2468
&config, NULL, NULL, &ret_errno);
2308
mc.server = avahi_server_new(avahi_simple_poll_get
2309
(mc.simple_poll), &config, NULL,
2310
NULL, &ret_errno);
2469
2311
2470
2312
/* Free the Avahi configuration data */
2471
2313
avahi_server_config_free(&config);
2486
2328
/* Create the Avahi service browser */
2487
2329
sb = avahi_s_service_browser_new(mc.server, if_index,
2488
2330
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2489
NULL, 0, browse_callback,
2490
(void *)&mc);
2331
NULL, 0, browse_callback, NULL);
2491
2332
if(sb == NULL){
2492
2333
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2493
2334
avahi_strerror(avahi_server_errno(mc.server)));
2504
2345
if(debug){
2505
2346
fprintf_plus(stderr, "Starting Avahi loop search\n");
2506
2347
}
2507
2508
ret = avahi_loop_with_timeout(simple_poll,
2509
(int)(retry_interval * 1000), &mc);
2348
2349
ret = avahi_loop_with_timeout(mc.simple_poll,
2350
(int)(retry_interval * 1000));
2510
2351
if(debug){
2511
2352
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2512
2353
(ret == 0) ? "successfully" : "with error");
2519
2360
}
2520
2361
2521
2362
/* Cleanup things */
2522
free(mc.interfaces);
2523
2524
2363
if(sb != NULL)
2525
2364
avahi_s_service_browser_free(sb);
2526
2365
2527
2366
if(mc.server != NULL)
2528
2367
avahi_server_free(mc.server);
2529
2368
2530
if(simple_poll != NULL)
2531
avahi_simple_poll_free(simple_poll);
2369
if(mc.simple_poll != NULL)
2370
avahi_simple_poll_free(mc.simple_poll);
2532
2371
2533
2372
if(gnutls_initialized){
2534
2373
gnutls_certificate_free_credentials(mc.cred);
2551
2390
}
2552
2391
}
2553
2392
2554
/* Re-raise privileges */
2393
/* Re-raise priviliges */
2555
2394
{
2556
ret_errno = raise_privileges();
2557
if(ret_errno != 0){
2558
errno = ret_errno;
2559
perror_plus("Failed to raise privileges");
2560
} else {
2561
2562
/* Run network hooks */
2563
run_network_hooks("stop", interfaces_hooks != NULL ?
2564
interfaces_hooks : "", delay);
2565
2566
/* Take down the network interfaces which were brought up */
2567
{
2568
char *interface = NULL;
2569
while((interface=argz_next(interfaces_to_take_down,
2570
interfaces_to_take_down_size,
2571
interface))){
2572
ret_errno = take_down_interface(interface);
2573
if(ret_errno != 0){
2574
errno = ret_errno;
2575
perror_plus("Failed to take down interface");
2576
}
2577
}
2578
if(debug and (interfaces_to_take_down == NULL)){
2579
fprintf_plus(stderr, "No interfaces needed to be taken"
2580
" down\n");
2581
}
2582
}
2583
}
2584
2585
ret_errno = lower_privileges_permanently();
2586
if(ret_errno != 0){
2587
errno = ret_errno;
2588
perror_plus("Failed to lower privileges permanently");
2589
}
2395
raise_privileges();
2396
2397
/* Run network hooks */
2398
run_network_hooks("stop", interfaces_hooks != NULL ?
2399
interfaces_hooks : "", delay);
2400
2401
/* Take down the network interfaces which were brought up */
2402
{
2403
char *interface = NULL;
2404
while((interface=argz_next(interfaces_to_take_down,
2405
interfaces_to_take_down_size,
2406
interface))){
2407
ret_errno = take_down_interface(interface);
2408
if(ret_errno != 0){
2409
errno = ret_errno;
2410
perror_plus("Failed to take down interface");
2411
}
2412
}
2413
if(debug and (interfaces_to_take_down == NULL)){
2414
fprintf_plus(stderr, "No interfaces needed to be taken"
2415
" down\n");
2416
}
2417
}
2418
2419
lower_privileges_permanently();
2590
2420
}
2591
2421
2592
2422
free(interfaces_to_take_down);
2593
2423
free(interfaces_hooks);
2594
2424
2595
2425
/* Removes the GPGME temp directory and all files inside */
2596
if(tempdir != NULL){
2426
if(tempdir_created){
2597
2427
struct dirent **direntries = NULL;
2598
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY |
2599
O_NOFOLLOW));
2600
if(tempdir_fd == -1){
2601
perror_plus("open");
2602
} else {
2603
#ifdef __GLIBC__
2604
#if __GLIBC_PREREQ(2, 15)
2605
int numentries = scandirat(tempdir_fd, ".", &direntries,
2606
notdotentries, alphasort);
2607
#else /* not __GLIBC_PREREQ(2, 15) */
2608
int numentries = scandir(tempdir, &direntries, notdotentries,
2609
alphasort);
2610
#endif /* not __GLIBC_PREREQ(2, 15) */
2611
#else /* not __GLIBC__ */
2612
int numentries = scandir(tempdir, &direntries, notdotentries,
2613
alphasort);
2614
#endif /* not __GLIBC__ */
2615
if(numentries >= 0){
2616
for(int i = 0; i < numentries; i++){
2617
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2618
if(ret == -1){
2619
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2620
" \"%s\", 0): %s\n", tempdir,
2621
direntries[i]->d_name, strerror(errno));
2622
}
2623
}
2624
2625
/* need to clean even if 0 because man page doesn't specify */
2626
free(direntries);
2627
if(numentries == -1){
2628
perror_plus("scandir");
2629
}
2630
ret = rmdir(tempdir);
2631
if(ret == -1 and errno != ENOENT){
2632
perror_plus("rmdir");
2633
}
2428
struct dirent *direntry = NULL;
2429
int numentries = scandir(tempdir, &direntries, notdotentries,
2430
alphasort);
2431
if (numentries > 0){
2432
for(int i = 0; i < numentries; i++){
2433
direntry = direntries[i];
2434
char *fullname = NULL;
2435
ret = asprintf(&fullname, "%s/%s", tempdir,
2436
direntry->d_name);
2437
if(ret < 0){
2438
perror_plus("asprintf");
2439
continue;
2440
}
2441
ret = remove(fullname);
2442
if(ret == -1){
2443
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2444
strerror(errno));
2445
}
2446
free(fullname);
2634
2447
}
2635
TEMP_FAILURE_RETRY(close(tempdir_fd));
2448
}
2449
2450
/* need to clean even if 0 because man page doesn't specify */
2451
free(direntries);
2452
if (numentries == -1){
2453
perror_plus("scandir");
2454
}
2455
ret = rmdir(tempdir);
2456
if(ret == -1 and errno != ENOENT){
2457
perror_plus("rmdir");
2636
2458
}
2637
2459
}
2638
2460
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0